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Null reference when filling form field in PDF


I am using Aspose.PDF for .Net 17.4 to fill a PDF form field using the following code:

Document pdfDocument = new Document(@“legal-aid-crm11-cost-summary (1).pdf”);
TextBoxField f = pdfDocument.Form[0] as TextBoxField;
f.Value = “test update”;

This throws a null reference exception when Value is being set - do I need to do something different here?
Form attached.

legal-aid-crm11-cost-summary (1).pdf (64.8 KB)


We have managed to reproduce the same issue at our side. For the sake of correction, we have logged this problem in our issue tracking system as PDFNET-50986. You will be notified via this forum thread once this issue is resolved.

We apologize for your inconvenience.